相关单词同义词required, obligatory, required routine, 近义词 obligatory, forced, required, mandatory反义词optional, voluntary临近词compunction, compulsive, compulsory pay, compulsory fee, compulsory law, compulsory fees, compulsory vote, compulsory stop, compulsory book, compulsory loan, compulsory debt, compulsory work相似词compromising, comptroller, compulsion, compulsive, compulsory purchase order, compunction, computational, computational linguistics, 返回 compulsory